Reads the value of a push-button and displays it's status continuously on the computer screen and by lighting a led on the Arduino as long as the button is pressed.
Read the value of a push-button (NO - normally open) connected to input pin 2 on the Arduino. We will continuously monitor and print the value as it changes. Also, we'll turn the led on pin 13 on when the switch is pressed.
The wiring is straightforward: Simply put a push-button between digital input 2 and +5V, guarded by a 10K resistor: